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Home > Success Center > Network Performance Monitor (NPM) > HTTP Error 503: The Server is unavailable

HTTP Error 503: The Server is unavailable

Updated March 11th, 2016


The following errors appear on the Orion Web Console:

Website configuration failed

Unable to restart Orion Application Pool. Please use IIS Manager to restart it manually

Web request for /Orion/Login.aspx failed - The remote server returned an error: (503) Server Unavailable


All Orion Core products


The error is caused when the configuration wizard is not able to start the application pool in IIS or after the server reboot. A sample error is shown below after running the configuration Wizard.


  1. Start the Application Pool in IIS.
  2. Launch IIS manager. Click Start > Run > inetmgr.
  3. Expand the server.
  4. Select Application Pools.
  5. Right-click SolarWinds Orion Application Pool > Start.


If this doesn't resolve issue continue on with clearing the .net cache: Refer to:

Last modified
16:25, 20 Jul 2017